diff --git a/app/build.gradle b/app/build.gradle
index 5a4c99f24..22574a10c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -36,13 +36,14 @@ dependencies {
 
     implementation 'androidx.paging:paging-runtime:2.1.0'
 
+    //anko
     def anko_version = '0.10.8'
     implementation "org.jetbrains.anko:anko-sdk27:$anko_version"
     implementation "org.jetbrains.anko:anko-sdk27-listeners:$anko_version"
-
-
+    //协程
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.2.1'
 
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/io/legado/app/base/BaseActivity.kt b/app/src/main/java/io/legado/app/base/BaseActivity.kt
new file mode 100644
index 000000000..45a4679a6
--- /dev/null
+++ b/app/src/main/java/io/legado/app/base/BaseActivity.kt
@@ -0,0 +1,55 @@
+package io.legado.app.base
+
+import android.os.Bundle
+import android.view.MenuItem
+import androidx.annotation.LayoutRes
+import androidx.appcompat.app.AppCompatActivity
+
+abstract class BaseActivity : AppCompatActivity() {
+
+    @LayoutRes
+    abstract fun getLayoutID(): Int
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(getLayoutID())
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+        item?.let {
+            if (it.itemId == android.R.id.home) {
+                supportFinishAfterTransition()
+                return true
+            }
+        }
+        return if (item == null) true else onCompatOptionsItemSelected(item)
+    }
+
+    open fun onCompatOptionsItemSelected(item: MenuItem): Boolean {
+        return true
+    }
+
+    override fun setTitle(title: CharSequence?) {
+        supportActionBar?.let {
+            it.title = title
+        }
+    }
+
+    override fun setTitle(titleId: Int) {
+        supportActionBar?.let {
+            it.setTitle(titleId)
+        }
+    }
+
+    fun setSubTitle(subtitle: CharSequence?){
+        supportActionBar?.let {
+            it.subtitle = subtitle;
+        }
+    }
+
+    fun setSubTitle(subtitleId: Int){
+        supportActionBar?.let {
+            it.setSubtitle(subtitleId)
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/base/README.md b/app/src/main/java/io/legado/app/base/README.md
new file mode 100644
index 000000000..d28e27909
--- /dev/null
+++ b/app/src/main/java/io/legado/app/base/README.md
@@ -0,0 +1 @@
+## 基类
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt b/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt
new file mode 100644
index 000000000..da7d6ba71
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt
@@ -0,0 +1,40 @@
+package io.legado.app.ui.widget
+
+import android.content.Context
+import android.util.AttributeSet
+import android.widget.FrameLayout
+import androidx.appcompat.app.AppCompatActivity
+import io.legado.app.R
+import kotlinx.android.synthetic.main.view_titlebar.view.*
+
+class TitleBar(context: Context, attrs: AttributeSet?) : FrameLayout(context, attrs) {
+
+    init {
+        inflate(context, R.layout.view_titlebar, this)
+    }
+
+    override fun onAttachedToWindow() {
+        super.onAttachedToWindow()
+        attachToActivity()
+    }
+
+    private fun attachToActivity(){
+        val activity = getCompatActivity(context)
+        activity?.let {
+            activity.setSupportActionBar(toolbar)
+            activity.supportActionBar?.let {
+                it.setDisplayHomeAsUpEnabled(true)
+            }
+        }
+    }
+
+    private fun getCompatActivity(context: Context?): AppCompatActivity? {
+        if (context == null) return null
+        return when (context) {
+            is AppCompatActivity -> context
+            is androidx.appcompat.view.ContextThemeWrapper -> getCompatActivity(context.baseContext)
+            is android.view.ContextThemeWrapper -> getCompatActivity(context.baseContext)
+            else -> null
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/view_titlebar.xml b/app/src/main/res/layout/view_titlebar.xml
new file mode 100644
index 000000000..6f86e663a
--- /dev/null
+++ b/app/src/main/res/layout/view_titlebar.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.appbar.AppBarLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/appBar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppTheme.AppBarOverlay">
+
+    <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:popupTheme="@style/AppTheme.PopupOverlay"/>
+
+</com.google.android.material.appbar.AppBarLayout>
\ No newline at end of file